Brazilian Federal Act 9,787/99, regulating generic medicines, includes rules for drug registration and provides for the population's access to safe, effective, high-quality, and low-cost medication. Four years after the introduction of generic drugs on the Brazilian market, we proposed to measure knowledge and information on generic drugs among the clientele at a public outpatient clinic in Recife, Pernambuco State, applying a questionnaire in 2000. 76.1% of the interviewees were women, 95.7% had heard of generic drugs, and 68.1% could define generic medication. Government action to publicize the properties of such medicines and their advantages for consumers has thus reached the vast majority of the population.